About the [No Value] Option
The [No Value] option is a special value available for some filters. Use this value when you want to filter items that do not have the filter property defined or do not match the other defined property values in the filter. You can use this [No Value] option with other filter criteria and apply this value to an individual filter.
You can use this filter, for instance, for filtering
Note: In the Data Source filter the value is [AlienVault Generic Plugin]. If you select this value, it means you are searching for